Britain's government will begin the process of leaving the European Union on March 29, starting the clock on two years in which to complete the most important negotiation for a generation.

Britain's permanent representative to the EU, Tim Barrow, informed the European Council President Donald Tusk of the timing on Monday morning, the U.K.'s Department for Exiting the European Union said in a statement.

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The notification of triggering Article 50 will come in the form of a letter.

"We are on the threshold of the most important negotiation for this country for a generation," Brexit secretary David Davis said. "The government is clear in its aims: a deal that works for every nation and region of the UK and indeed for all of Europe - a new, positive partnership between the UK and our friends and allies in the European Union."

Brexit Secretary David Davis said in a statement that the country is "on the threshold of the most important negotiation" for a generation.

Britain voted 52 percent to 48 percent to leave the European Union in a referendum on June 23.